土壤의 物理化學性 時期別 變化와 옥수수 生育에 關한 硏究 = Changes of Soil Physico-chemical Properties and Corn Growth at Different Growing Stages

다국어 초록 (Multilingual Abstract)

This study was carried out to establish the optimum ranges of soil physico-chemical improvement in corn fields. Soil physico-chemical properties and corn growth were investigated at different growth situations, soil depths and dates. The results obtained were summarized as follows ;
Growing degree days(GDD) of Suwon 19 variety of corn was 818.2℃.
Solid and liquid phase percent of well growth fields were lower than poor growth, but air phase was higher. In well growth fields distributed ranges of three phase were 38-49% in solid, 8-27% in liquid and 24-53% in air phase by seasonal changes.
Soil bulk denisty and hardness of well growth were lower than poor growth fields, those of that were higher in deeper depths.
Soil pH were above 5.1 in the well growths. Organic matter was lower in the deeper depths and the latter growing stages. Cation exchange capacity of surface soil were higher than subsoil, but no differences during crop growing.